warnings::MaybeFatal - make warnings FATAL at compile-time only
use strict; use warnings qw(all); use warnings::MaybeFatal; # Use of uninitialized value. # Run-time warning, so this is non-fatal. print join(undef, "a", "b"); # Useless use of constant in void context. # Compile-time warning, so this is fatalized. "Hello world"; 1;
Because it's kind of annoying if a warning stops your program from being compiled, but it's really annoying if it breaks your program part way through actually executing.
This lexically scoped pragma will make all warnings (including custom warnings emitted with the
warn keyword) FATAL during compile time. It does not enable or disable any warnings in its own right. It just makes any warnings that happen to be enabled FATAL during the compile.
(Note that the compile phase and execute phase are not as cleanly divided in Perl as they are in, say, C. If module X loads module Y at run-time, then module Y's compile time happens during module X's run-time. In this situation, a warning that is triggered while compiling Y will be FATAL, even though from module X's perspective, this is at run-time.)
Please report any bugs to http://rt.cpan.org/Dist/Display.html?Queue=warnings-MaybeFatal.
Toby Inkster <email@example.com>.
This software is copyright (c) 2014 by Toby Inkster.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.